Hail in Jefferson County, Montana
Hail July 12, 2019 · Jefferson County, Montana
Where the report was made, with tornadoes recorded within 15 miles over the years.
What the National Weather Service wrote
Trained spotter reported 1.5 inch hail in Whitehall.
The wider storm
A of broad low pressure area over the Pacific Northwest exerted an influence on Montana's weather for much of the weekend. This resulted in a persistent unstable southwest flow over the region, which pumped in mid and upper level moisture along with passing disturbances embedded within the flow. In the upper levels, a jet stream was situated in a favorable position to produce upper level divergence. Meanwhile, a low level easterly flow was present for a significant period of time, which further increased moisture levels and wind shear. During the peak of this event, precipitable water values approached the one inch mark, effective wind shear values were as high as 50kts, and mid-level lapse rates soared to 7.5 to 8 degree C per Kilometer. The combination of these conditions provided an environment primed for a weekend of severe thunderstorms for much of the region.
Began near Whitehall (45.8700, -112.1000).
Source: NOAA Storm Events Database, event 840774. Narratives are written by the National Weather Service forecast office that issued the report.
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